9+19+199+······+199······9(200个9)怎么算
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9+19+199+······+199······9(200个9)怎么算
求19+199+1999+19999·······+1999···99(2002个9)的简便计算
简算:1999+199·9+19·99+1·999+2·111
99···9 * 99···9 + 199···9(2008个9) (2008个9) (2008个9)
1-2+3-4+5-6+7-8+9-10+······+199简便计算
(101+103+···+199)-(90+92···+188
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1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
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101+102+···+198+199+200=多少
199+195+191+···+3等于?
求···············
四年级下册语文第9课主要内容简便完整,很急啊····························